O-Ring NBR 26x2.5 mm 70 Shore A

O-Ring NBR 26x2.5 mm 70 Shore A - 1000 pcs

O-Ring NBR 26x2.5 mm 70 Shore A is an elastomeric sealing ring with an inside diameter of 26 mm and a cross-section diameter of 2.5 mm. It is manufactured from NBR - Nitrile Butadiene Rubber with a nominal hardness of 70 Shore A. The product is supplied in a bulk package containing 1000 O-rings.

O-Ring NBR 26x2.5 mm Technical Specification

Product type: O-Ring / sealing ring

Material: NBR

Material name: Nitrile Butadiene Rubber

Nominal hardness: 70 Shore A

Inside diameter ID: 26 mm

Cross-section CS: 2.5 mm

Nominal size: 26x2.5 mm

Cross-section shape: Circular

Calculated nominal outside diameter OD: 31 mm

Package quantity: 1000 pcs

O-Ring 26x2.5 mm Dimensions

The designation:

26x2.5 mm

specifies the two principal dimensions of the O-ring:

26 mm - inside diameter ID

2.5 mm - cross-section diameter CS

The first value does not represent the outside diameter.

The nominal outside diameter can be calculated geometrically:

OD = ID + 2 x CS

For this O-ring:

OD = 26 + (2 x 2.5)

Therefore:

OD = 31 mm

The calculated nominal outside diameter is:

31 mm

This is a geometric value derived from the nominal ID and CS dimensions rather than a separate tolerance specification.

What Is an O-Ring 26x2.5 mm?

An O-ring is an:

elastomeric sealing element with a circular cross-section

This particular O-ring has a nominal:

26 mm inside diameter

and:

2.5 mm cross-section

When installed in a correctly designed groove, the elastomer is compressed between the mating components.

This controlled deformation creates contact with the sealing surfaces and enables the O-ring to function as part of the complete sealing arrangement.

NBR Material

This O-ring is manufactured from:

NBR

which stands for:

Nitrile Butadiene Rubber

NBR is an elastomer widely used for manufacturing technical O-rings and other sealing components.

Material selection should be evaluated according to the requirements of the specific application, including:

working medium

temperature

pressure

groove geometry

static or dynamic operation

and:

overall operating conditions

Exact operating limits depend on the specific NBR compound and complete sealing arrangement.

What Does 70 Shore A Mean?

The nominal hardness of this O-ring is:

70 Shore A

also written as:

70 ShA

Shore A is a hardness scale used for elastomeric materials.

Hardness is an important part of the O-ring specification.

Therefore:

NBR 26x2.5 mm 70 Shore A

should not automatically be considered technically identical to an O-ring with the same dimensions but a different hardness.

How Does an O-Ring Work?

An O-ring is installed in an appropriately designed sealing groove.

When the mating components are assembled, the circular elastomeric cross-section is:

compressed in a controlled manner

This deformation creates contact between the O-ring and the surrounding sealing surfaces.

Correct sealing performance depends on multiple factors, including:

O-ring dimensions

groove geometry

material

hardness

compression

working medium

and:

operating conditions

The O-ring should therefore be considered as one component of the complete sealing system.

Typical O-Ring Applications

O-rings are used as sealing components in many types of machinery and technical equipment.

Typical areas where O-rings may be found include:

industrial machinery

hydraulic systems

pneumatic systems

pumps

valves

cylinders

technical fittings

mechanical equipment

maintenance and repair

and:

MRO operations

Suitability of the exact NBR 26x2.5 mm 70 Shore A O-ring must always be evaluated for the specific sealing arrangement.

How to Select O-Ring NBR 26x2.5 mm

Before ordering, verify:

Inside diameter ID - 26 mm

Cross-section CS - 2.5 mm

Material - NBR

Hardness - 70 Shore A

Nominal size - 26x2.5 mm

and the requirements of the application:

groove dimensions

working medium

operating conditions

sealing arrangement

static or dynamic operation

Selection based only on the visual appearance of an old O-ring may result in incorrect size identification.

How to Measure an O-Ring

The two principal dimensional parameters are:

ID - Inside Diameter

and:

CS - Cross Section

For this product:

ID = 26 mm

CS = 2.5 mm

The calculated nominal outside diameter is:

OD = 31 mm

Because elastomers are flexible, measurements taken from a used O-ring may differ from the original nominal dimensions due to stretching, compression, wear or permanent deformation.

Where available, equipment documentation, part specifications and groove dimensions should also be used for identification.

Pack of 1000 O-Rings

This product is supplied as a bulk package containing:

1000 pcs

The 1000-piece package is particularly suitable for:

industrial maintenance

MRO

production facilities

service departments

repair workshops

machine manufacturers

assembly operations

and businesses using this O-ring size repeatedly.

The sales unit for this offer is:

1000 O-rings

O-Ring 26x2.5 vs Other Sizes

When comparing O-ring sizes, both:

ID

and:

CS

must be checked.

An O-ring specified as:

26x2.5 mm

is not automatically interchangeable with another O-ring having a 26 mm inside diameter but a different cross-section.

A change in cross-section changes the geometry of the sealing element and its relationship with the sealing groove.

Material and Hardness Matter

Two O-rings with identical:

26x2.5 mm

dimensions are not necessarily technically identical.

The following should also be compared:

material

hardness

and:

application requirements

The complete basic specification of this product is:

NBR 26x2.5 mm 70 Shore A

Changing the material to FKM, EPDM, VMQ or another elastomer changes the material specification of the sealing element.

Selection and Interchangeability

A potential replacement should be compared using the complete specification:

ID = 26 mm

CS = 2.5 mm

Material = NBR

Hardness = 70 Shore A

as well as the requirements of the sealing arrangement.

Matching nominal dimensions alone do not confirm complete interchangeability between O-rings manufactured from different materials or with different hardness values.

Full Technical Data

Product: O-Ring

Material: NBR

Material name: Nitrile Butadiene Rubber

Nominal hardness: 70 Shore A

Inside diameter ID: 26 mm

Cross-section CS: 2.5 mm

Nominal dimensions: 26x2.5 mm

Calculated nominal outside diameter OD: 31 mm

Cross-section: Circular

Package quantity: 1000 pcs

FAQ - O-Ring NBR 26x2.5 mm 70 Shore A

What are the dimensions of this O-ring?

The inside diameter ID is 26 mm, and the cross-section CS is 2.5 mm.

What does 26x2.5 mm mean?

The first value, 26 mm, is the nominal inside diameter. The second value, 2.5 mm, is the cross-section diameter.

What is the outside diameter of a 26x2.5 mm O-ring?

The calculated nominal outside diameter is 31 mm, based on OD = ID + 2 x CS.

What material is this O-ring made from?

The O-ring is manufactured from NBR - Nitrile Butadiene Rubber.

What is the hardness of this O-ring?

The nominal hardness is 70 Shore A, also written as 70 ShA.

How many O-rings are included in the package?

The package contains 1000 pcs.

Is an FKM or EPDM O-ring 26x2.5 mm the same product?

No. FKM, EPDM and NBR are different elastomer materials. Identical dimensions alone do not make the products technically identical.

Can a similar O-ring size replace 26x2.5 mm?

Not automatically. Both the inside diameter and cross-section should match the requirements of the sealing groove, together with material, hardness and application conditions.

AI Overview

O-Ring NBR 26x2.5 mm 70 Shore A is an elastomeric sealing ring with a 26 mm inside diameter and 2.5 mm cross-section, manufactured from Nitrile Butadiene Rubber with a nominal hardness of 70 Shore A. Its calculated nominal outside diameter is 31 mm. The product is supplied in a bulk package containing 1000 pcs.